<?php
class JSSDK {
  private $appId;
  private $appSecret;

  public function __construct($appId, $appSecret) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
  }

  public function getSignPackage() {
    $jsapiTicket = $this->getJsApiTicket();
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
    $timestamp = time();
    $nonceStr = $this->createNonceStr();

    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

    $signature = sha1($string);

    $signPackage = array(
      "appId"     => $this->appId,
      "nonceStr"  => $nonceStr,
      "timestamp" => $timestamp,
      "url"       => $url,
      "signature" => $signature,
      "rawString" => $string
    );
    return $signPackage; 
  }

  public function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

  
  
  public function getJsApiTicket() {
      // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
      $data = json_decode(file_get_contents("/var/www/hisense-card/jsapi_ticket.json"));
      if ($data->expire_time < time()) {
          $accessToken = $this->getAccessToken();
          // 如果是企业号用以下 URL 获取 ticket
          // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
          $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
          $res = json_decode($this->httpGet($url));
          $ticket = $res->ticket;
          if ($ticket) {
              $data->expire_time = time() + 600;
              $data->jsapi_ticket = $ticket;
              $fp = fopen("/var/www/hisense-card/jsapi_ticket.json", "w");
              fwrite($fp, json_encode($data));
              fclose($fp);
          }
      } else {
          $ticket = $data->jsapi_ticket;
      }
      
      return $ticket;
  }
  
  
  public function getHaiToken() {
      $data = json_decode(file_get_contents("/var/www/hisense-card/hai.json"));
      if ($data->expire_time < time()) {
          
          $appId='wx_zhiguang';
          $appSecret='wn22d01hged73s82le';
          $url='http://sweixinapi.hisense.com/openapi/token?grant_type=client_credential&appid='.$appId.'&secret='.$appSecret;
          $res = json_decode($this->httpGet($url));
          $access_token = $res->access_token;
          
          if ($access_token) {
              $data->expire_time = time() + 600;
              $data->access_token = $access_token;
              $fp = fopen("/var/www/hisense-card/hai.json", "w");
              fwrite($fp, json_encode($data));
              fclose($fp);
          }
      } else {
          $access_token = $data->access_token;
      }
      return $access_token;
  }

  public function getAccessToken() {
      $hai_token=$this->getHaiToken();
      
      $url='http://sweixinapi.hisense.com/interface/weChatExternal/qryAccessToken?access_token='.$hai_token;
      
      $data=json_decode($this->httpGet($url),true);
      return $data['data'];
  }
  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
  }
}

